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doc/bdev: document bdev_null

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Change-Id: I5b48e798b0540ef7fbc99699ebf6dc913c075b44
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/376861
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
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Daniel Verkamp 2017-09-01 16:27:28 -07:00 committed by Jim Harris
parent 744a785b76
commit 7fc4405c5d
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doc/bdev.md
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@ -57,6 +57,21 @@ Configuration file syntax:
This exports 4 malloc block devices, named Malloc0 through Malloc3. Each malloc block device will
be 64MB in size.
## Null {#bdev_config_null}
The SPDK null bdev driver is a dummy block I/O target that discards all writes and returns undefined
data for reads. It is useful for benchmarking the rest of the bdev I/O stack with minimal block
device overhead and for testing configurations that can't easily be created with the Malloc bdev.
Configuration file syntax:
~~~
[Null]
# Dev <name> <size_in_MiB> <block_size>
# Create an 8 petabyte null bdev with 4K block size called Null0
Dev Null0 8589934592 4096
~~~
## Linux AIO {#bdev_config_aio}
The SPDK aio bdev driver provides SPDK block layer access to Linux kernel block devices via Linux AIO.